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Chuck Hagel is sworn into office as the 24th defense secretary by Michael L. Rhodes, the Defense Department's director of administration and management, as Hagel's wife, Lilibet, holds a Bible at the Pentagon, Feb. 27, 2013.

Black-and-white photos serve as reminders of Lt. Col. David Butler's service in Vietnam. Butler, now 63 and a member of the Florida National Guard, served with the 101st Radio Research Company at Phu Bai in central Vietnam in 1969.